POLYPETALOUS EXOGENOUS PLANTS. 267 



CE. RHOMBiPETALA, Nutt. Tall, erect; leaves lance- 

 linear, sessile, acute, spreading, lower ones petiolate, becom- 

 ing somewhat pinnatitid; spike strict; flowers large, 

 longer than the leafy bracts; calyx-i\xbQ very slender, 3-4 

 times longer than the sessile ovary ; ])etaU rhombic-ellip- 

 tical, acute or acuminate ; capsule small. Flowers straw- 

 yellow. — Marcy. 



(E. BIENNIS, L. Hairy, hirsute, or smoothish; stem 

 tall, often simple; leaves lanceolate and ovate-lanceolate, 

 acute, wavy and toothed or serrate on the margins, the ear- 

 liest ones sometimes pinnatitid; sjnkes leafy, at length 

 elongated ; calyx-tuhe longer than the lobes ; floivers large. 

 ((E. muricata, Pursh; GE. grandiflora. Ait.) Stem 2°-4° 

 high. Varies greatly in pubescence and size of the flower. 



CE. siNUATA, L. Hairy or downy; stems ascending or 

 diffuse ; leaves oblong, pinnately lobed, the lowest pinnati- 

 fid; floivers small, axillary; calyx and ca2:>s2ile hairy. 

 Passes through several intermediate forms into Var. humi- 

 FUSUM, Torr. and Gray. Stems prostrate, hoary; leaves 

 small, lanceolate, sparingly toothed or entire. Stems 2-4° 

 high. 



** CapmUe obovate or davate, furrowed, and more or less peduncled ; flowers 

 expanding in sunshine. 



CE. SPECIOSA, Nutt. Perennial, puberulent ; stems erect 

 or ascending, flexuous, often branching; leaves lanceolate 

 or oblong-lanceolate, attenuate at the base, the radical and 

 lower cauline ones pinnatitid, or pinnately toothed; floivers 

 (large) in a loose at length elongated sjoike ; tube of the 

 calyx longer than the ovary, but shorter than the con- 

 spicuously acuminate segments; capsules slightly pediceled, 

 thick and almost ligneous, clavate-obovate, rather acute, 

 strongly 8-ribbed, the alternate ribs cristate. — Drwiwiond. 



(E. Spachiana. Annual, minutely pubescent; stem 

 simple or branching from the base; leaves lanceolate or 



